IEC 62443 Simplified for Industrial Networks
A practical framework for implementing IEC 62443 cybersecurity standards in operational technology environments without requiring deep cybersecurity expertise.
Created by Daniel "Riverman" Caudle, ISA-99 (IEC 62443) committee member.
SECURE is a six-phase implementation methodology that maps directly to IEC 62443 requirements:
- Segment Your Networks (Zones and Conduits, 3-2)
- Establish Security Levels (Security Level Targets, 3-3)
- Control Access (Access Control, FR1)
- Update Responsibly (Patch Management, 2-3)
- Respond to Incidents (Incident Response, 2-1)
- Evaluate Continuously (Cybersecurity Management System, 2-1)
Plant engineers, operations managers, and industrial network professionals who need to implement IEC 62443 without a dedicated cybersecurity team. The framework prioritizes availability over confidentiality, operational continuity over theoretical perfection, and risk-based implementation over checkbox compliance.
Industrial cybersecurity that breaks production isn't security. The SECURE Method treats OT security as an operational discipline, not an IT overlay. Every recommendation assumes that safety and uptime come first.
Developed in 2025 from direct experience implementing IEC 62443 across industrial environments including energy, manufacturing, and critical infrastructure. Born from the observation that most IEC 62443 guidance is written for consultants, not for the plant personnel who actually have to live with it.
© 2025 Daniel "Riverman" Caudle
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
You are free to use, share, and adapt this material for non-commercial purposes with attribution. Commercial use requires written permission from the author.
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